JGB Futures Surge as US-Iran Deal Eases Inflation Concerns

Japanese Government Bond (JGB) futures experienced a significant rally in Tokyo trading sessions, driven by reports of an impending peace agreement between the United States and Iran. This development led to a decline in global crude oil prices, fostering expectations of easing inflationary pressures and bolstering investor confidence.

The positive momentum began on June 11, when US President Donald Trump signaled via social media that a peace agreement with Iran was nearing. Subsequently, reports on June 12 suggested that an interim US-Iran peace agreement could be signed as early as that weekend, aiming to end military hostilities, reopen the Strait of Hormuz, and lift the US blockade on Iranian oil exports. In response, West Texas Intermediate (WTI) crude oil futures plummeted by over 3%, while US consumer inflation expectations also receded. In Japan, the benchmark 10-year JGB yield dropped by 0.040 percentage points to 2.640% on June 12, reflecting the surge in bond prices.

Efforts to resolve tensions between the US and Iran have intensified, with discussions focusing on the release of frozen Iranian funds. These negotiations continue through ongoing message exchanges between Washington and Tehran, even amidst existing confrontations. The framework of the interim deal reportedly centers on a temporary easing of Iran's control over the Strait of Hormuz and the termination of the US blockade on Iranian ports. These developments have significantly diminished geopolitical risk perceptions in the Middle East, bringing a sense of relief to global markets.

The positive shifts triggered a broad rally across global bond markets, leading to plunges in US Treasury yields as well. Previously, inflation concerns, fueled by rising oil prices due to US military operations against Iran and escalating Middle East tensions, had created selling pressure in the Japanese bond market, pushing JGB yields higher. However, the hopes for peace reversed this trend, alleviating corporate cost burdens and upward pressure on consumer prices in Japan. Risk-on sentiment also improved in equity markets, with Nikkei futures showing signs of recovery after earlier declines.

From a broader economic and political perspective, this agreement holds critical importance, especially for energy markets. Japan's economy is highly dependent on the Gulf region for over 90% of its crude oil imports, making the security of the Strait of Hormuz and the reduction of supply chain disruption risks vital. Earlier, in April 2026, the failure of US-Iran peace talks had driven 10-year JGB yields to nearly 30-year highs due to fears of an energy supply shock and accelerating inflation. Therefore, the current agreement is viewed as a significant step towards ensuring regional stability and securing global energy flows.

Market analysts will closely monitor the progress of peace negotiations and the timeline for crude oil supply normalization in the coming period. Experts emphasize the need to carefully assess the extent of progress in peace talks and the time lag before crude oil supply actually normalizes. Furthermore, expectations for a narrowing interest rate differential between Japan and the US could introduce potential volatility in the USD/JPY currency pair. The Bank of Japan's (BOJ) monetary policy decisions will also be influenced by these changes in the inflation outlook, with the BOJ's future communication remaining crucial for market participants.